Influence of time of calcium hydroxide iodoform paste replacement in the treatment of root perforations / Influência no tempo de substituição de pasta de hidróxido de calcio. Pasta iodoformada no tratamento das perfurações radiculares

ABSTRACT

A method for sealing endodontic perforations with calcium hydroxide iodoform paste was experimentally carried out in root canals of dogs. The material was changed according to a prefixed combination of every 7, 15, 30 or 60 days. Different histological responses occurred depending on the time of material replacement. The best results occurred when the paste was changed after 7 or after 7 and 15 days. New mineralized tissue was observed when material was replaced after 60 days; however, at the end of this experimental period, some inflammatory cells were still present